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My Kinderland Public School, Monthly Test DEC-2021, , , , , , , , , , Class-Sth, Science, sie Subject-Seie ome, 1) Tick the correct option :i) Our body gets energy from ale, (a)Proteins (b)Vitamins, (©)Carbohydrates (minerals, ‘oil erosion makes the soil f, (a)Less fertile (b)more fertile, (rich in minerals (d)lose air, The most abundant gas in the air is, (@Oxygen (b)Hydrogen, (©)nitrogen (d)Carbon dioxide ; er:, iv)When water vapour in the air windiness on a surface, especially during the night it is called., (a)Rain (b)Hail (c)Snow (d)Dew, »)A sample machine used to left heavy weights with the help of rope is, (@)An inclined plane (b)A pulley, (A Wheel and axle (@)A Wedge, 2) True and False [5x15], , a) Airhas mass, b) A Wedge is simple machine made up of two inclined plane ., ©) Animals living on the land breathe through their skin,, 4) Knife is example of third class lever., ©) Wheel and axle is a complex machine, 3) Answer the following question in one sentence [5x3=15], a) What is nitrogen fixation 2, ») How does afforestation help in preventing soil erosion ?, ©) Name the six different types of simple machines ., @) Why is carbon dioxide used in fire extinguishers ?, ©) What is lever 2, ‘) Answer the following questions in two or three sentence, 2) Differentiate between the first clas and third class of levers 2, ») Describe two advantages of tertace forming, 5) Fillin the blanks, a) Moving wind and ..., b) Terrace forming in method of soil ., ©) The layer of air that surrounds the ., 4) Walls of mud built along ri, , OOoU, , , , , , , , , , , , e)